Overview
SteamShot is a simplified hybrid thermal cycle for a small 2-stroke ICE in which steam is the primary working body and gasoline acts only as a trigger for a phase transition. Per cycle, a precisely metered water charge and a much smaller trigger charge of gasoline are injected into a small-displacement combustion chamber; the spark burns the gasoline, flash-boiling the water into a steam burst that builds pressure to a level matching conventional combustion peak, while cutting fuel use by up to roughly 80%. It evolves the existing ICE rather than replacing it.
Applications
Ultra-efficient urban scooters; micro-agriculture engines; UAV auxiliary systems; small low-CO₂ off-grid generators; educational/R&D platforms.
Users: small-engine OEMs, off-grid operators, R&D labs.
Operating Principle
Intake/compression: a metered water charge and a smaller trigger charge of gasoline are injected together and compressed at an elevated ratio → ignition: a spark ignites the gasoline fraction, flash-boiling the water charge → power stroke: the resulting steam-and-gas mixture expands to a pressure comparable to a conventional combustion stroke, driving the piston → exhaust: the large majority of the exhaust is steam, with condensate captured for reuse → optional cooling/vacuum: cool-water injection gives sub-atmospheric intake assist. Condensate can be re-injected (water reuse).
Limitations: figures are lab-calculated from steam tables, not bench-measured; recuperation efficiency, injector precision, and real fuel rate are unproven.
Key Parameters
Platform: small-displacement 2-stroke engine. Target pressure: comparable to conventional combustion peak pressure. Steam temperature at target pressure: consistent with that pressure level, well above the water's boiling point. The water charge is sized so it fully flash-boils on ignition, absorbing the gasoline's combustion energy in the process. Fuel mass per cycle is reduced roughly 5–6× relative to a standard gasoline-only cycle of the same displacement, once water preheat recuperation is accounted for. Compression ratio is elevated relative to a standard gasoline-only cycle to promote flash-boiling, with injection timed tightly around piston top dead center.
Note: all values are calculated from steam tables and source PDFs; bench validation pending.
Architecture and Components
Stock small-displacement 2-stroke ICE base; dual injection (water + gasoline); spark ignition + control board; heat exchanger on head and exhaust (water preheat); condensate separator (wet trap); pressure sensor + data logger; precision micro-injectors.
Advantages
Technical: mechanical simplicity (no turbine, minimal electronics); high torque from steam impulse; inherent water-based cooling; runs on existing engine base. Economic: ~70–80 % less gasoline per cycle; retrofit of stock engines. Environmental: >90 % water-vapour exhaust; CO₂ down 5–6× (proportional to fuel); moist exhaust traps CO₂→H₂CO₃ and NOx→HNO₂/HNO₃ in condensate.
Integrations
Builds on stock 2-stroke ICE platforms; condensate-neutralizing reservoir; pairs with ARBOK heat-recovery and separator concepts. Transition technology between fossil and full electrification.
Deployment & Operation
Prototype path: replace carburettor with dual injectors (water + fuel) → add microcontroller for precise timing/sync → bench-test pressure, power, fuel rate, emissions. Water preheated via head jacket and exhaust; condensate routed to neutralizing reservoir.
TRL
TRL 3 (confirmed by Michael). Experimental proof-of-concept: the cycle is worked out analytically (steam tables, energy balance) and component choices identified, but nothing is bench-validated. (Supersedes the legacy "TRL 4–5" claim — the card itself states bench tests are still in preparation.)
TRL scale:
- TRL 1 — basic principles observed
- TRL 2 — technology concept formulated
- TRL 3 — experimental proof-of-concept ← SteamShot
- TRL 4 — validated in lab
- TRL 5 — validated in relevant environment
- TRL 6 — demonstrated in relevant environment
- TRL 7 — prototype in operational environment
- TRL 8 — system complete and qualified
- TRL 9 — proven in operational environment
Market Potential
Billions of small 2-stroke/4-stroke engines (scooters, gensets, agri/UAV) face tightening emissions rules and cannot be electrified cheaply. A fuel-light, low-CO₂ retrofit cycle on stock engines — if bench data confirm the calculations — addresses small-engine and off-grid segments as a transition technology.
Typical Project Economics
Value from ~5–6× lower fuel use and reuse of stock engine hardware. No CAPEX/OPEX/unit-cost or payback figures in source — flagged as missing; economics indicative until bench data exist.
Risk Factors
All performance figures are calculated, not measured — bench validation is the key gate. Recuperation efficiency and injector precision unproven; corrosion/scaling and thermal losses need mitigation (stainless/ceramics, insulation). Real-world fuel rate may exceed the ideal. Emissions chemistry claims (CO₂/NOx capture in condensate) unquantified.
Related Technologies
ARBOK-BF (Binary Fuel) · MW-SPARKER · TEG-Blanket